Crossword Genius

Style of cryptic down clue? (3)

Ross

I believe the answer is:

ton

'style' is the definition.
('fashion' in French)

I don't understand how the remainder of the clue works.

(Other definitions for ton that I've seen before include "A slang 100 mph" , "See 25" , "Speed" , "2240lbs" , "Imperial unit of weight" .)

I've seen this clue in The Times.
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